/Engine/Source/Runtime/Engine/Classes/Components/InputComponent.h
Binds a delegate function for an axis key (e.g. Mouse X). Returned reference is only guaranteed to be valid until another axis key is bound.
template<class UserClass> [FInputAxisKeyBinding](API\Runtime\Engine\Components\FInputAxisKeyBinding) & BindAxisKey ( const [FKey](API\Runtime\InputCore\FKey) AxisKey, UserClass * Object, typename FInputAxisHandlerSignature::TMethodPtr< UserClass > Func )